

function jia(a,b) {
    console.log(a+b);
    return a+b;
}

module.exports.jia = jia;

function jian(c,d){
    console.log(c-d);
    return c-d;
}
module.exports.jian =jian;

function cheng(e,f){
    console.log(e*f);
    return e*f;
}
module.exports.cheng =cheng;

function chu(g,h){
    console.log(g/h);
    return g/h;
}
module.exports.chu =chu;
